MSG4 was pretty good. If I had a criticism about it, and really MGS in general, is it had way too many cutscenes, and they were way too long.
The 2 MGS PSP games are pretty good, though they kind of get too strategy like with all the solider management and stuff like that. I like Peace Walker so far but some of it feels like too much work.
Currently Playing: Dead Space 3 (X360)